.alert {
    display: none;
    position: fixed;
    text-align: center;
    top: 1%;
    left: 50%;
    min-width: 100px;
    min-height: 10px;
    margin-left: -50px;
    padding: 10px 10px 10px 10px;
    border: 1px solid black;
    border-radius: 2px;
}

/**信息提示**/
.alert-info {
    color: #000000;
    font-size:14px;
    background-color: #E6F1FF;
    border-color: #2089FF;
}
.alert-success {
    color: #5cb85c;
}

.alert-warning {
    color: #8a6d3b;
    background-color: #fcf8e3;
    border-color: #faebcc;
}

.alert-danger {
    color: #a94442;
    background-color: #f2dede;
    border-color: #ebccd1;
}